Matrix-band retainer.



No. 698,280. Patented Apr. 22, I902.

A. J. mmx zn. MATRIX BAND RETAINER.

Application filed Sept. 23. 1901.) (No Model.)

A from?! UNITED I STATES PATENT I OFF CE.

ANDREW J. HINIKER, OF sAN FRANCISCO, CALIFORNIA. I

MATRIX-BAND RETAINER.

SPECIFICATiON formingpart of Letters Patent N 0. 698,280, dated April 22, 1902. Application filed September 23, 1901. Serial No. 76,318. I (No model.)

To all whmn it 17mg concern:

Be it known that I, ANDREW J HINIKER, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Matrix Band Retainers, of which the followingis a specification. A T

Myinvention relates to an improved matrixband retainer, the object of my invention being to provide a deviceof this character which can be adjusted easily upon the tooth without danger of the retainer pressing on the gums andwhich will also admit of a wedge being placed between said matrix-band and the ad-;

joining tooth in order to hold the band up to the tooth which it is desired to fill; one, moreover, in which the band can be constricted very firmly around the tooth without danger of slipping out of the retainer and one in which the construction shall be simpler than those heretofore in use.. I I

My invention therefore resides in the novel construction, combination, and arrangement of parts for the above ends, hereinafter fully specified, and particularly'p'ointed out in the claim. I I

In the accompanying drawings, Figure 1 is a perspective viewof" myimproved device. Fig. 2 is an enlarged plan .view of the same. Fig. 3 is an enlargedend view. Fig. 4 is an enlarged side view. Fig. 5 is a section on the line A A of Fig. 4, and Fig. his a plan view of the matrix-band blank.

Referring to the drawings, 1 represents amatrix-band adapted to. fit around a tooth preparatory to filling thereon; Each end of said band has two perforations 2, through which pass guides 3, fixedly secured at one end in a head4, and passing through a. sliding head 5. The perforated ends of the band are held on said guides between said heads, and thus when said heads are brought together by thesliding of the head 5.upon the guides 3 the matrix band is constricted around the tooth. In order to slide said head 5 upon the guides 3, there is pivoted a screw 6, having one end 7 rotatable in the head 4, and the head 5 having a threaded aperture 8, Y

in which the screw 6 works. Said screw 6 is squared at the end to fit-in the end of the tightening-key.

(Not shown.) It will now readily be seen that by screwing the screw 6 in one direction the band will-be constricted around the tooth, and by screwing it, in the opposite direction the band will be loosened.

The valuable features of this invention are as follows By securing the ends of the ma-" 1' trix-band by means of two perforations in each end through which the guides3 pass the heads 4 5 maybe made quite small, so that the whole retainer for said band is small. This-renders the device much more conven I ient in operation, since the tooth to be filled is much more accessible. Thuswith this con-- struction it is easy to insert a wedge between the band and the adjoining tooth to hold the I V hand up to the tooth to be filled. Again, in I prior devices the band has been secured by its end being bent out and passed through slits in the heads 4 5. Not only does this construction necessitate much larger heads, thereby rendering the retainer of comparatively large size and awkward in operation, but the construction is insecure, since the hold of the band by its bent ends in said slits is not positive; but said bent ends maypossibly slip'out of said slits under great strain.

By using the guides 3n t only as guides Q In witness whereof I have hereunto se'tmy hand in the presence of two subscribing witnesses.

Witnesses:

FRANCIS M. WRIGHT, GEoEL-IA POWNING.

ANDREW J. HINIKERI- 

